Introduction, Physiology, and Cells 48a A&P: Nervous System - - - PowerPoint PPT Presentation

48a A&P: Nervous System - Introduction, Physiology, and Cells

48a A&P: Nervous System - Introduction, Physiology, and Cells

Class Outline 5 minutes Attendance, Breath of Arrival, and Reminders 10 minutes Lecture: 25 minutes Lecture: 15 minutes Active study skills: 60 minutes Total

Early Warning:

• By class 63b, you must be signed-up for and logged into MassagePrep.training
• You will receive an email from our receptionist with instructions for signing up.

Assignments:

• 50b Business: Marketing: it is recommended that you watch the webinar listed in the Class Schedule.
• 53a Internship Orientation Review Questions (due before class starts)
• 55a Review Questions (due before class starts)

Quizzes:

• 51b Kinesiology Quiz (brachialis, brachioradialis, flexor digitorum superficialis, and extensor

digitorum) Preparation for upcoming classes:

• 49a A&P: Nervous System - Synaptic Transmission and Central Nervous System
• 49b Side-lying and Pregnancy Massage: Guided Full Body

– Bring 2 pillows (standard size) – Bring 4 pillowcases (standard size)

48a A&P: Nervous System - Introduction, Physiology, and Cells

Class Reminders

Classroom Rules

Punctuality - everybody’s time is precious

• Be ready to learn at the start of class; we’ll have you out of here on time
• Tardiness: arriving late, returning late after breaks, leaving during class, leaving

early The following are not allowed:

• Bare feet
• Side talking
• Lying down
• Inappropriate clothing
• Food or drink except water
• Phones that are visible in the classroom, bathrooms, or internship

You will receive one verbal warning, then you’ll have to leave the room.

Brachioradialis

Trail Guide, Page 133

Brachioradialis is superficial

• n the lateral side of the

forearm. Its long, oval belly forms a helpful dividing line between the flexors and extensors. It is the only muscle that runs the length of the forearm but does not cross the wrist joint.

Anterior View

• Anterior View

O A I

Anterior View

O A I

Anterior View

O A I

Anterior View

O A I

Anterior View

48a A&P: Nervous System - Introduction, Physiology, and Cells Packet E - 97

Endocrine System Nervous System The body uses two systems to monitor and stimulate , changes needed to maintain homeostasis: endocrine and nervous.

Introduction

Endocrine System

• 1. Slow response
• 2. Hormones

Nervous System The endocrine system responds more slowly and uses hormones as chemical messengers to cause physiologic changes.

Introduction

Endocrine System

• 1. Slow response
• 2. Hormones

Nervous System

• 1. Rapid response
• 2. Nerve impulses (and

neurotransmitters too) The nervous system responds to changes more rapidly and uses nerve impulses to cause physiologic changes.

Introduction

Endocrine System

• 1. Slow response
• 2. Hormones

Nervous System

• 1. Rapid response
• 2. Nerve impulses (and

neurotransmitters too)

• 3. Body control
• 4. Body communications
• 5. Monitors and regulates the

endocrine system It is the nervous system that is the body's master control and communications system. It also monitors and regulates many aspects of the endocrine system.

Introduction

Every thought, action, and sensation reflects nerve activity. We are what our brain has experienced. If all past sensory input could be completely erased, we would be unable to walk, talk, or communicate. We would remember no pain or pleasure.

Introduction

Brain Spinal cord Cranial nerves Spinal nerves Cerebrospinal fluid Meninges Sense organs Neurotransmitters

Anatomy

Brain Spinal Cord Nerves

Sensory input Interpretive functions Motor output Higher mental functioning and emotional responsiveness

Physiology

Sensory input Sensory receptors detect changes, or stimuli , inside the body such as lowered blood sugar levels, or outside the body such as an increase in temperature. Sensory neurons carry nerve impulses into the spinal cord and brain .

Physiology

Interpretive functions The spinal cord and brain integrate sensory ,

• information. They analyze it, store some of it, and decide on appropriate

responses.

Physiology

Motor output Motor neurons carry nerve impulses from the brain and spinal cord to smooth muscle, cardiac muscle, skeletal muscle, and glands .

Physiology

Higher mental functioning and emotional responsiveness Examples: cognition, memory , joy, excitement, anger, anxiety.

Physiology

Basic Organization

The Nervous System CNS PNS ANS SNS Sympathetic Division Parasympathetic Division

Central nervous system (AKA: CNS) Body system primarily concerned with interpreting incoming sensory information and issuing instructions in the form of motor responses. Includes: brain, meninges, cerebrospinal fluid, and spinal cord.

Brain Spinal cord Central Nervous System

Basic Organization

Peripheral nervous system (AKA: PNS) Composed of the cranial and spinal nerves emerging from the CNS.

Basic Organization

Brain Spinal Cord Nerves

CNS in green PNS in yellow

Somatic nervous system (AKA: SNS) Voluntary division of the PNS that transmits information from bones, muscles, joints , skin, and special senses of vision, hearing, taste, and smell into the CNS. Carries impulses from the CNS to skeletal muscles.

Basic Organization

Autonomic nervous system (AKA: ANS) Involuntary , division of PNS supplying impulses to smooth muscle, cardiac muscle, and glands. Has sympathetic and parasympathetic divisions. Sympathetic division of the ANS - Fight, Flight, or Freeze Parasympathetic division of the ANS - Rest and Digest

Basic Organization

Neuroglia Neuron

Cells of the Nervous System

Neuroglia (AKA: glia, glial cells) Connective tissue that supports, nourishes, protects, insulates, and organizes neurons. Types: astrocyte, ependymocyte, microglia, oligodendrocyte, Schwann cell, satellite cell.

Cells of the Nervous System

Neuron Impulse-conducting cell. Properties: Excitability Conductibility Secretability

Cells of the Nervous System

Excitability The ability to respond to a stimulus and convert it to a nerve impulse. Conductibility The ability to transmit the impulses to other neurons, muscles, and glands. Secretability The ability to release neurotransmitters that help conduct an impulse.

Cells of the Nervous System

Cell body Dendrite Axon

Parts of a Neuron

Cell body (AKA: cyton) Main region of the neuron containing the nucleus, ribosomes, and other organelles. The gray matter of the nervous system.

Parts of a Neuron

Dendrite Short, narrow, neural extensions that receive and transmit stimuli toward the neuron's cell body.

Parts of a Neuron

Axon Neural extension that carries nerve impulses away from the neuron toward another neuron, a muscle cell, or gland.

Parts of a Neuron

Telodendria Myelin sheath Nodes of Ranvier

Axon Structures

Telodendria Clusters of short, fine filaments located at the end of each axon.

Axon Structures

Myelin sheath Fatty tissue layer surrounding most axons in the PNS. Insulates the neuron and increases nerve impulse speed.

Axon Structures

Nodes of Ranvier Gaps along myelinated axons. Increase speed of a nerve impulse by allowing the impulse to jump from one node to another.

Axon Structures

• neuron → fascicle → nerve
• endoneurium → perineurium → epineurium

Connective Tissues: Neurons to Nerve

Fasciculi (s. fascicle) Bundles of neurons . Nerve Bundle of fasciculi . Endoneurium Connective tissue layer for a neuron . Perineurium Connective tissue layer for a fascicle . Epineurium Connective tissue layer for a nerve .

Connective Tissues: Neurons to Nerve

• neuron → fascicle → nerve
• endoneurium → perineurium → epineurium

Connective Tissues: Neurons to Nerve

Sensory neuron Interneuron Motor neuron

Classification of Neurons

Sensory neuron (AKA: afferent neuron) Carries impulses to the CNS.

Classification of Neurons

Sensory neuron (AKA: afferent neuron) Carries impulses to the CNS.

Classification of Neurons

Interneuron (AKA: association neuron) Neuron between a sensory , and motor neuron. Participates in integrative functions.

Classification of Neurons

Motor neuron (AKA: efferent neuron) Sends a nerve impulse to effectors.

Classification of Neurons

Effector Any muscle or gland that motor nerves act on.

Classification of Neurons

Nerve Impulses

Nerve impulse (AKA: action potential) An electrical signal that conveys information along a neuron.

48a A&P: Nervous System - Introduction, Physiology, and Cells